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STOCKHOLDERS' EQUITY
 9 Months Ended
Sep. 30, 2021
Stockholders' Equity Note [Abstract]  
STOCKHOLDERS' EQUITY STOCKHOLDERS’ EQUITY
A summary of changes in stockholders’ equity is presented below (in thousands): 
 Nine Months Ended September 30, 2021
 (In thousands)
 Number of
Shares		Common
Stock		Additional
Paid-In
Capital		Retained
Earnings		Total
Balance at December 31, 202037,512 $375 $455,762 $1,891,731 $2,347,868 
Net earnings— — — 131,843 131,843 
Stock-based compensation expense— — 5,367 — 5,367 
Issuance of stock435 4 (4)— — 
Share repurchases(100)(1)(8,384)— (8,385)
Balance at March 31, 202137,847 $378 $452,741 $2,023,574 $2,476,693 
Net earnings— — — 167,389 167,389 
Stock-based compensation expense— — 3,223 — 3,223 
Share repurchases(200)(2)(19,159)— (19,161)
Balance at June 30, 202137,647 $376 $436,805 $2,190,963 $2,628,144 
Net earnings— — — 200,752 200,752 
Stock-based compensation expense— — 5,845 — 5,845 
Issuance of stock3 — — — — 
Share repurchases(95)— (9,471)— (9,471)
Balance at September 30, 2021$37,555 $376 $433,179 $2,391,715 $2,825,270 
 Nine Months Ended September 30, 2020
 (In thousands)
 Number of
Shares		Common
Stock		Additional
Paid-In
Capital		Retained
Earnings		Total
Balance at December 31, 201938,199 $382 $505,352 $1,468,256 $1,973,990 
Net earnings— — — 71,152 71,152 
Stock-based compensation expense— — 6,437 — 6,437 
Issuance of stock398 4 (4)— — 
Share repurchases(1,000)(10)(60,803)— (60,813)
Balance at March 31, 202037,597 $376 $450,982 $1,539,408 $1,990,766 
Net earnings— — — 90,678 90,678 
Stock-based compensation expense— — 3,157 — 3,157 
Issuance of stock6 1 (1)— — 
Balance at June 30, 202037,603 $377 $454,138 $1,630,086 $2,084,601 
Net earnings— — — 109,118 109,118 
Stock-based compensation expense— — 6,130 — 6,130 
Issuance of stock9 — — — — 
Balance at September 30, 202037,612 $377 $460,268 $1,739,204 $2,199,849